很多人把 groupby 理解成单纯的求和、计数这类操作，比如说算算总收入、数数用户量，然后就没了。实际上它的应用场景要广得多：计算组内特征、数据标准化、构造滚动指标、合并不同维度的统计结果，甚至处理一些复杂的嵌套数据结构。 所以本文将介绍10个 ...

When it comes to working with data in a tabular form, most people reach for a spreadsheet. That’s not a bad choice: Microsoft Excel and similar programs are familiar and loaded with functionality for ...